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is in decline. researchers at the australian institute of marine science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now picking up speed or whether thi
right by medical science, is really critical for achieving health and preventing these diseases. so the green new deal is a win/win win because it gets us to clean energy which can stop the climate crisis, jump start our economy, creating three times as many jobs as every dollar spent in the fossil fuel economy, and it puts us back to work. so it's a win/win win all around. host: dawn, joining us from oxford, alabama with dr. jill stein, last call. good morning to you. caller: good morning. i kind of agree with an awful lot of what you said about the cause of all this. but the one thing that you admitted and i'm cureuse about, what would -- kaoeurous about, what would make a banker with the subprime mortgage, what would make him -- which the whole goal is to make money, as much as he can, what would make a banker loan money to somebody that he knows was not going to be able to pay him back? and then do they just think -- get a meeting and say we're going to create these instances where we're going to loan money for people to buyouts, paopl that can't pay it back and sell it to someb
. there is some corals that live for many thousands of yeernz we found through some of the science we do we can drill holes down to the center of the corals and look at annual growth rings and we can look at when, in fact, when the first agriculture in australia happened, we saw a change in the type of chemistry that the annual growth rings and coral were depositing. so we have seen a chronology of increased siltation, of increased fertilization, of
Search Results 0 to 9 of about 10 (some duplicates have been removed)